Zacharias Swaab was a son of Hijman Swaab and Veronica Cohen. He and Betje Koopman married in 1920 in Amsterdam.
Stadsarchief Amsterdam, archiefkaart Zacharias Swaab
According to a list with shops of Jewish owners, compiled by the Amsterdam police in 1940, this family had a grocery store, address: Korte Houtstraat 11 in Amsterdam.
Abstracts of the police archives which are currently at the Amsterdam municipal archives